Improvement in pulley-blqoz



intro faire stent ffies.

JON A. BURNP, 0F ALBANY, NEW YORK.

Lette/rs Patent No. 71,973, dated December IO, 1867. i

IMPROVEMENT IN PULLEY-BLOGK.

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T0 ALL WHOM IT MAY CONGERN:

Be it known that I, JoHN A. EURNAP, ofAlbany, in the county of Albany,and in the State of New York, haveinvented certain new and usefulImprovements in Friction-Rollers; and do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings 'and to the letters of referencemarked thereon.

In the annexed drawings, making part of this specification, au representthe friction-rollers, which are made of cast iron, and are leftunturned, thereby preserving the hard surface or scale, which is moredurable than any turned surface. As thesel rollers are not to beturned,their hardness maybe increased by casting them in chills. Arepresents a frame, which is cast'of any suitable metal, and used forthe purpose of' holding in place the friction-rollers a a. This freineis in cylindrical form, and about :is long as the deptlof the eye of thepulley, but insteadpof being cest solid, is formed as follows: I take a.hollow cylinder and cut s, series of grooves in it, from near one endftotheoth-er, said grooves extending through the cylinder, from itsperiphery to its centre opening, thus leaving a series of arms,supported at only one end. These arms are mede with concave or planesides, or they may be cylindrical, and the rollers a aero to be placedbetween them, or if the arms are cylindrical they muy be reduced'insize, and the rollers, east hollow, may be placed upon them. This framemay be inserted in the eye of the pulley F,ibeing m'ade to work easilyin it. The bolt or pin d, which contines the pulley to the block,- isthen passed through the Cylinder or frame, and secured by a, nut orother device.

The eri her of the rollers pro'ects to or be ond the eri her of theframe, and also toor beyond the innerY P P y J y P P y faces or sides ofthe arms, so that -when the pulley is in position for Work,4 the rollersbear-against the eye of the pulley, and also upon the bolt or pin d. Thepulley runs with great ease bythis arrangement, and the rollers arealways held apart and in proper position. This frame may be cast, as arethe rollers, and both may' be inserted in the pulley at very littlecost.

Having thus fully described nay invention, what I claim as new, anddesire to secure by Letters Patent, is .The arrangement of the frame Eand pulley'F, through the eye of which is inserted the frame A, havingfa. series of rollers,' a a, the .whole constructed and usedsubstantially as specified'.

' In testimony that I elairn the foregoing, Iha-ve hereunto set my hand,this 11th day of October, 1867. JOHN A. BURNAP.

.Witnesses:

ABRAHAM V. DE WITT, JAMES H; MELIGK.

